That is a neat site Casey. Some of those are really funny.

Chalkboard Art - the site is in Japanese but you can still look at the amazing pictures of chalkboard art. http://kokubanart.nichigaku.co.jp/

Travel Signposts - eyewitness reports, background information and practical tips about places in 22 countries in Europe. http://www.travelsignposts.com/

Oooh that's hard! My screen has value differences (which is what's being tested, not color differences) from top to bottom, and also some from left to right because it's angled. I got 28 but then had a black one and couldn't find it. I tried again with the display centered better, and still got 28 even though they were in a different order. How do you get 33? It stopped at 29 for me.